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unix: unsafe-wrap install_main_guard_default

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This commit is contained in:
Jubilee Young 2024-07-17 00:08:05 -07:00
parent 6ed563d491
commit d47cb26ddd
1 changed files with 12 additions and 9 deletions
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21
library/std/src/sys/pal/unix/stack_overflow.rs
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@ -419,6 +419,7 @@ mod imp {
Some(stackaddr - page_size..stackaddr) Some(stackaddr - page_size..stackaddr)
} }
#[forbid(unsafe_op_in_unsafe_fn)]
unsafe fn install_main_guard_default(page_size: usize) -> Option<Range<usize>> { unsafe fn install_main_guard_default(page_size: usize) -> Option<Range<usize>> {
// Reallocate the last page of the stack. // Reallocate the last page of the stack.
// This ensures SIGBUS will be raised on // This ensures SIGBUS will be raised on
@ -429,19 +430,21 @@ mod imp {
// read/write permissions and only then mprotect() it to // read/write permissions and only then mprotect() it to
// no permissions at all. See issue #50313. // no permissions at all. See issue #50313.
let stackptr = stack_start_aligned(page_size)?; let stackptr = stack_start_aligned(page_size)?;
let result = mmap64( let result = unsafe {
stackptr, mmap64(
page_size, stackptr,
PROT_READ | PROT_WRITE, page_size,
MAP_PRIVATE | MAP_ANON | MAP_FIXED, PROT_READ | PROT_WRITE,
-1, MAP_PRIVATE | MAP_ANON | MAP_FIXED,
0, -1,
); 0,
)
};
if result != stackptr || result == MAP_FAILED { if result != stackptr || result == MAP_FAILED {
panic!("failed to allocate a guard page: {}", io::Error::last_os_error()); panic!("failed to allocate a guard page: {}", io::Error::last_os_error());
} }
let result = mprotect(stackptr, page_size, PROT_NONE); let result = unsafe { mprotect(stackptr, page_size, PROT_NONE) };
if result != 0 { if result != 0 {
panic!("failed to protect the guard page: {}", io::Error::last_os_error()); panic!("failed to protect the guard page: {}", io::Error::last_os_error());
} }